CN-122009326-A - Steering wheel angle detection device, steering system and vehicle

Abstract

The application provides a steering wheel angle detection device, a steering system and a vehicle, wherein the steering wheel angle detection device comprises a bracket, a rotor, a driving gear, a driven gear, a magnetic piece and a first sensing module, wherein the rotor is connected with a steering shaft and driven by the steering shaft to rotate, the driving gear is sleeved on the periphery of the rotor and fixed with the rotor, the driven gear is meshed with the driving gear, an installation space is arranged in the central area of the driven gear, the magnetic piece is arranged in the installation space, the peripheral wall of the magnetic piece is provided with an edge angle which is used for limiting and matching with the driven gear in the circumferential direction, the driven gear is also axially and limitedly matched with the magnetic piece, and the first sensing module is configured to detect the rotation angle of the steering shaft by detecting the magnetic field intensity of the magnetic piece. The steering wheel angle detection device can prevent the magnetic piece from relative displacement with the driven gear, and improve the working reliability and the service life of the steering wheel angle detection device.

Inventors

• CHEN FENG
• ZHOU RUIZHEN

Assignees

• 武汉理岩控制技术有限公司

Dates

Publication Date

20260512

Application Date

20260318

Claims (20)

1. 1. A steering wheel angle detection apparatus, comprising: A bracket; The rotor is connected with the steering shaft and driven by the steering shaft to rotate; the driving gear is sleeved on the periphery of the rotor and is fixed with the rotor; The driven gear is meshed with the driving gear, and an installation space is formed in the central area of the driven gear; the magnetic piece is arranged in the installation space, the peripheral wall of the magnetic piece is provided with an edge angle, the edge angle is used for being in limit fit with the periphery of the driven gear, and the driven gear is also in limit fit with the axial direction of the magnetic piece; A circuit board; The first sensing module is arranged on the circuit board and is configured to detect the rotating angle of the steering shaft by detecting the magnetic field intensity of the magnetic piece.
2. 2. The steering wheel angle detection apparatus according to claim 1, wherein the inner wall of the installation space further covers at least part of the areas of both end faces of the magnetic member in the axial direction.
3. 3. The steering wheel angle detection apparatus according to claim 1, wherein the magnetic member includes a first end face and a second end face that are opposite in an axial direction of the rotor, the first end face and the second end face being equal in area.
4. 4. A steering wheel angle detection apparatus according to claim 3, wherein a cross-sectional area of the magnetic member is constant along an axial direction of the rotor.
5. 5. The steering wheel angle detection apparatus according to claim 1, wherein the magnetic member is a permanent magnet having a polygonal cross section.
6. 6. The steering wheel angle detection apparatus according to claim 5, wherein the peripheral wall of the magnetic member includes a plurality of side walls connected in series in a circumferential direction, and the corner angle is formed by protruding at least a part of the structures of the side walls.
7. 7. The steering wheel angle detection apparatus according to claim 5, wherein the peripheral wall of the magnetic member includes a plurality of side walls that are sequentially connected in a circumferential direction, and adjacent two of the side walls together define the corner angle.
8. 8. The steering wheel angle detection apparatus according to claim 1, wherein the corner is formed with a biting incline, the biting incline being inclined with respect to side walls on both sides of the corner.
9. 9. The steering wheel angle detection apparatus according to claim 1, wherein the driven gear is integrally injection-molded with the magnetic member, or the driven gear is detachably connected with the magnetic member.
10. 10. The steering wheel angle detection apparatus according to claim 1, wherein the driven gear is a plastic member.
11. 11. The steering wheel angle detection apparatus of claim 10, wherein the injection molding material of the driven gear comprises polybutylene terephthalate or polyamide 66.
12. 12. The steering wheel angle detection apparatus according to any one of claims 1 to 11, wherein the first sensing module includes a hall element.
13. 13. The steering wheel angle detection apparatus according to any one of claims 1 to 11, wherein the rotor includes an input rotor and an output rotor, the input rotor and the output rotor being located on both sides of the circuit board, respectively; The steering wheel angle detection device further comprises a second induction module, wherein the second induction module is arranged on the circuit board and is configured to perform electromagnetic induction with the input rotor and the output rotor respectively so as to detect the rotation angle and the steering torque of the steering shaft.
14. 14. The steering wheel angle detection apparatus according to claim 13, wherein the circuit board has a center plane perpendicular to a thickness direction thereof; The second induction module comprises an induction chip, a first induction coil, an exciting coil and a second induction coil, wherein the first induction coil and the second induction coil are both arranged on the circuit board and are respectively positioned on two opposite sides of the central surface, and the exciting coil is positioned on one side of the first induction coil; The first induction coil is used for detecting a first angle of the input rotor, the second induction coil is used for detecting a second angle of the output rotor, and the induction chip determines the rotation angle and the steering torque of the steering shaft according to the first angle and the second angle.
15. 15. The steering wheel angle detection apparatus of claim 14, wherein the number of cycles of the first induction coil and the second induction coil are comparable.
16. 16. The steering wheel angle detection apparatus according to claim 14, wherein the number of the second sensing modules is two, both the second sensing modules are used for detecting the turning angle and the turning torque of the steering shaft, and one of the second sensing modules is a main sensing module and the other of the second sensing modules is a correction module.
17. 17. The steering wheel angle detection apparatus of claim 14, further comprising a calculation module electrically connected to the first sensing module and the second sensing module, respectively, the calculation module configured to obtain a first angle signal output by the first sensing module and a second angle signal output by the second sensing module, and calculate the first angle signal and the second angle signal with a vernier algorithm to calculate a steering angle of the steering shaft.
18. 18. The steering wheel angle detection apparatus according to any one of claims 1 to 11, wherein the driven gear is one, and the number of the magnetic members and the number of the first sensing modules each correspond to the driven gear.
19. 19. A steering system comprising the steering wheel angle detection apparatus according to any one of claims 1 to 18.
20. 20. A vehicle comprising the steering system of claim 19.

Description

Steering wheel angle detection device, steering system and vehicle Technical Field The application relates to the technical field of vehicle sensors, in particular to a steering wheel angle detection device, a steering system and a vehicle. Background In an electric power steering system of an automobile, a torque angle sensor is one of core components, and performance of the torque angle sensor directly affects accuracy and reliability of the steering system. The angle measurement generally adopts a Hall principle, and the magnetic field change of the magnet gear synchronously rotating along with the steering shaft is sensed by the sensing assembly, so that an electric signal corresponding to the rotation angle is output. However, the existing magnet gear has the following problems that under the working conditions of long-term rotation and vibration, the binding force of the magnet and the gear is easy to weaken, so that the magnet is easy to slip and even fall off, an angle signal is abnormal, and potential safety hazards exist. Disclosure of Invention The embodiment of the application provides a steering wheel angle detection device, a steering system and a vehicle, which can improve the combination stability of a magnetic piece and a driven gear so as to improve the working reliability and the service life of the steering wheel angle detection device. The application provides a steering wheel angle detection device which comprises a support, a rotor, a driving gear, a driven gear, a magnetic piece, a circuit board and a first sensing module, wherein the rotor is used for being connected with a steering shaft and driven by the steering shaft to rotate, the driving gear is sleeved on the periphery of the rotor and fixed with the rotor, the driven gear is meshed with the driving gear, an installation space is arranged in the central area of the driven gear, the magnetic piece is arranged in the installation space, the peripheral wall of the magnetic piece is provided with an edge angle, the edge angle is used for being in limiting fit with the periphery of the driven gear, the driven gear is also in axial limiting fit with the magnetic piece, and the circuit board is provided with the first sensing module which is configured to detect the rotating angle of the steering shaft by detecting the magnetic field intensity of the magnetic piece. In some embodiments, the inner wall of the installation space also covers at least part of the areas of the two end faces of the magnetic piece along the axial direction. In some embodiments, the magnetic member includes first and second end surfaces opposite in an axial direction of the rotor, the first and second end surfaces having an equal area. In some embodiments, the magnetic member has a constant cross-sectional area along an axial direction of the rotor. In some embodiments, the magnetic member is a permanent magnet having a polygonal cross-section. In some embodiments, the peripheral wall of the magnetic member includes a plurality of side walls connected in series in a circumferential direction, and the corner is formed by protruding at least part of the structures of the side walls. In some embodiments, the peripheral wall of the magnetic member includes a plurality of side walls connected in series in a circumferential direction, and two adjacent side walls together define the corner angle. In some embodiments, the corner is formed with a snap slope that is sloped with respect to the sidewalls on either side of the corner. In some embodiments, the driven gear is integrally injection molded with the magnetic member, or the driven gear is removably coupled to the magnetic member. In some embodiments, the driven gear is a plastic piece. In some embodiments, the injection molding material of the driven gear includes polybutylene terephthalate or polyamide 66. In some embodiments, the first sensing module includes a hall element. In some embodiments, the rotor comprises an input rotor and an output rotor, and the steering wheel angle detection device further comprises second sensing modules, wherein the input rotor and the output rotor are respectively located on two sides of the second sensing modules, and the second sensing modules are configured to respectively conduct electromagnetic induction with the input rotor and the output rotor so as to detect the rotation angle of the steering shaft. In some embodiments, the circuit board comprises a first side surface and a second side surface which are opposite to each other along the thickness direction of the circuit board, the first side surface is opposite to the input rotor, the second side surface is opposite to the output rotor, the circuit board is provided with a center surface perpendicular to the thickness direction of the circuit board, the second induction module comprises an induction chip, a first induction coil, an exciting coil and a second induction coil, the first induction coil and the second ind